Believe it or not I've come across a rig (just the one) that was alot worse than that thing I posted up on here, the guy was a smoker... he'd sit on his pc in his little room smoking pretty much constantly anyways when it come to him asking for help because his rig wouldn't stay on for more than a few minutes, it was a moment I'll never forget... must of been centimeters of thick solid tar all under CPU HSF and plastered to the motherboard and exhaust fan which actually couldn't move due to the tar build up!!

Rant over.... I may give the guy a call and see if he's been looking after it this time

I'm a smoker but I do clean my PC on an regular basis I'm just happy that most of the dust and crud gets caught by the air filters on my case makes cleaning a whole lot easier

and yes not exactly the worst I've seen either I once had one come in from a Leather Tannery plant just your standard desktop case type took the lid off and you couldn't see what was in there literally the dust and crud was over the top edge of the PCI cards no wonder it died

i just took some quick shots of my new EVGA GeForce GTX 570 (i bought used) with my LG Optimus 2x:

GPU:

Memory cooling:

with this cooling my card is around 54~55°C // 129.2~131°F running 24mins of MSI Kombuster and clocked as SC which is 797/975/1594mhz @ 1.013v which is stuck for my card ^^;

the former owner replaced the stock cooler with this bcs the card reached around 80°c // 176°F in his case running 2xEVGA GTX570 and he though that was hot so he changed the cooler to this a little over two slots cooler ~.~